A negative face has an outward normal pointing in a direction opposite that of the positive x-axis.

负向的外法线指向与正x轴相反的方向。

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We hope that France take positive actions to create conditions for the bilateral relations to return to the normal track.

我们希望法方能采取积极行动，为中法关系尽快回到正常轨道创造条件。

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But that introduces false positive results; in other words, some normal tissues are marked as suspicious.

但这却导致了假阳性的结果，换句话说，一些正常的组织反而被怀疑癌变。

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The right perspective on pressure can create a very positive new normal, which I discuss in my recent leadership column on CEO.com.

FORBES: 6 Ways To Conquer Leadership Pressure

Dr. Robert Bonow, chief of cardiology at Northwestern University's Feinberg School of Medicine, notes that about 10 percent of study participants with a positive test had normal coronary arteries, and 17 percent of those with a normal test had coronary disease.

CNN: Newer heart test may not be better

At least 20% of those who screen positive on questionnaires may have normal cognition, which would only be apparent with more testing.

WSJ: New Push For Early Testing, Treatment For Dementia